Stopper



FIG. 1 is a top plan view of a stopper showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a cross-sectional view taken in the direction of the arrows along line 6—6 of FIG. 5; and,

FIG. 7 is a left side elevational view thereof. 

I claim the ornamental design for stopper, as shown. 